Acoustical enclosure



FIG. 1 is a perspective view of an acoustical enclosure showing my new design;

FIG. 2 is a reduced-scale left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an acoustical enclosure, as shown. 